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Finding the Fourth Proportional to 290.74, 435.90 and 136.58

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Solution

The fourth proportional to 290.74, 435.90 and 136.58 is: 204.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.74 : 435.90 = 136.58 : x
  2. Step 2: Convert to fraction form
    290.74/435.90 = 136.58/x
  3. Step 3: Cross multiply
    290.74x = 435.90 × 136.58
  4. Step 4: Simplify right side
    290.74x = 59,535.22
  5. Step 5: Solve for x
    x = 59,535.22/290.74
  6. Step 6: Final answer
    x = 204.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.